linux-kernel - [PATCH 5.12 113/161] ALSA: hda: update the power

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Date:   Tue,  8 Jun 2021 20:27:23 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hui Wang <hui.wang@...onical.com>,
        Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 5.12 113/161] ALSA: hda: update the power_state during the direct-complete

From: Hui Wang <hui.wang@...onical.com>

commit b8b90c17602689eeaa5b219d104bbc215d1225cc upstream.

The patch_realtek.c needs to check if the power_state.event equals
PM_EVENT_SUSPEND, after using the direct-complete, the suspend() and
resume() will be skipped if the codec is already rt_suspended, in this
case, the patch_realtek.c will always get PM_EVENT_ON even the system
is really resumed from S3.

We could set power_state to PMSG_SUSPEND in the prepare(), if other
PM functions are called before complete(), those functions will
override power_state; if no other PM functions are called before
complete(), we could know the suspend() and resume() are skipped since
only S3 pm functions could be skipped by direct-complete, in this case
set power_state to PMSG_RESUME in the complete(). This could guarantee
the first time of calling hda_codec_runtime_resume() after complete()
has the correct power_state.

Fixes: 215a22ed31a1 ("ALSA: hda: Refactor codec PM to use direct-complete optimization")
Cc: <stable@...r.kernel.org>
Signed-off-by: Hui Wang <hui.wang@...onical.com>
Link: https://lore.kernel.org/r/20210602145424.3132-1-hui.wang@canonical.com
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/pci/hda/hda_codec.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -2973,6 +2973,7 @@ static int hda_codec_runtime_resume(stru
 #ifdef CONFIG_PM_SLEEP
 static int hda_codec_pm_prepare(struct device *dev)
 {
+	dev->power.power_state = PMSG_SUSPEND;
 	return pm_runtime_suspended(dev);
 }

@@ -2980,6 +2981,10 @@ static void hda_codec_pm_complete(struct
 {
 	struct hda_codec *codec = dev_to_hda_codec(dev);

+	/* If no other pm-functions are called between prepare() and complete() */
+	if (dev->power.power_state.event == PM_EVENT_SUSPEND)
+		dev->power.power_state = PMSG_RESUME;
+
 	if (pm_runtime_suspended(dev) && (codec->jackpoll_interval ||
 	    hda_codec_need_resume(codec) || codec->forced_resume))
 		pm_request_resume(dev);